Method of producing iron cores for electromagnetic coils



humanism-1,1938

* STATES ms'rnon or senescent: more menus eon mmewsrrc cents Wilhelm fieheppmmn,

-Neuiempeihof,

Germany, nssignor to (L Lorena Ahtiengesellsohaft, BerEEn-Tempelhefi, Germany, it enmpany No Drawing." Application 3niy M, 1835,

No. 30,913. In Germany Jiuiy id, 151% ZClaims.

It is well known to produce the iron cores for electromagnetic coils, especially those for selfinduction coils intended for high frequency purposes, of a finely divided iron powder. "1'0 such 5 end a powder or this natureis embedded in an insulating material that acts to separate the iron particles from each other. The powder in this state is compressed to form a core of the desired shape.

. 10 The invention relates tom'ethods of producing such cores of this type as are intended for high frequency circuits; It is proposed by the invention to make use of amber in producing an insulating material adapted for the said purpose. In

' 5 this way the property of the amber is utilised that it isla material of small dielectric losses.

The novel method is as ioilows. The known iron powder is mixed with a solution of amber not too viscid. After mixing, which '20 must be made very caretuily'inorder to obtain a substance as homogeneous as possible, the pow der is dried, Each iron particle" has thus been coated with a thin layer of amber, The powder when dry is, before getting compressed to form the core, moistened with some turpentine oil in 5 

